JP3493599B2 - Vibration actuator for voice and low frequency vibration generation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a portable telephone or the like and is used to call when a signal arrives, and is used for notifying by not only voice but also vibration. In particular, it can be used for the purpose of making it small and lightweight.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional example which is a premise of the present invention. This is Japanese Patent Application No. 8-31919, 8-24026.
1, 8-240262, 8-270790, 8-324
997 and 8-324998, the annular flat portion 45 to which the coil 40 is adhered is flexibly supported by the damper 44 and adhered at the central portion of the magnetic circuit by the damper support 48. Although fixed, the bonding area is small, and the permanent magnet 41 , the yoke 42 and the plate 43 of the magnetic circuit are positioned and fixed by a jig so that their centers coincide with each other. Therefore, it takes time and labor to assemble the magnetic circuit and the vibrating body, and since they are bonded and fixed in a small area, there is a problem in reliability against a large impact.

[0003]

SUMMARY OF THE INVENTION The present invention uses a structure of an electroacoustic transducer having a drive coil to assemble a vibration actuator for generating voice and low frequency vibration, which is capable of generating both voice and vibration. It takes time and manpower to ensure accuracy, and is highly reliable against strong external shocks.

[0004]

To achieve the above object, the present invention provides a permanent magnet having a central hole in the magnetization direction,
With a yoke having a central hole attached to one magnetic pole end surface of this permanent magnet, a magnetic circuit having an annular magnetic gap is formed, and a coil wound around a bobbin forming a vibrating body is arranged in the magnetic gap, In a vibration actuator having an electric vibration converter attached to a cover, which applies an AC electric signal to the coil to cause relative vibration between the coil and the magnetic circuit, a central hole portion of the magnetic circuit including the permanent magnets. The central hole portion of the vibrating body having the coil is fixed by a non-magnetic support column, the magnetic circuit is flexibly supported by the cover with a flexible structure, and the AC signal has a frequency lower than a sound frequency. When the signal is a signal, the relative vibration is transmitted to the cover through the flexible structure, and when the AC signal is a high frequency sound frequency, the relative vibration causes the relative vibration. Chromatography is a voice and low-frequency vibration actuator for generating vibration, characterized in that to emit sound by vibrating.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a vibration actuator for generating sound and low frequency vibration according to the present invention. It is provided on the back side of the cover 2, which is a part of the housing of the mobile phone and corresponds to the part to be put on the ear. In FIG. 1, a moving coil type electroacoustic transducer that generates sound is used. In order to support the center position and the upper and lower positions of the vibrating body 1,
Using a damper 7 that can be displaced relatively softly in the vertical direction,
The portion 9 having the central hole integrated with the damper 7 is supported by the large diameter portion 19 of the support column.

In the magnetic circuit, a magnetic plate 6 having a central hole is provided on one magnetic pole of the permanent magnet 4 magnetized in the thickness direction having a central hole, and the other magnetic pole is molded. The yoke 5 made of a magnetic material having a central hole is provided, and all the central holes are inserted and fixed to the supporting column 16, but the vibrating body 1 is also fixed to the supporting column 16 via the damper 7. It is preferable that the support column 16 is made of metal, and the upper end portion 18 and the lower end portion 20 are crushed by pressure so that the whole is firmly fixed. At this time, when the upper end portion 18 is crushed via the metal ring 17, the portion 9 having the central hole is not damaged and is stably fixed. With this configuration, it has reliability even if a large external shock is repeated.

A plurality of spiral dampers 7 are formed inside the vibrating annular flat portion 8 and the other end is fixed to a support pillar 16 in the center of the magnetic circuit to reduce the overall diameter, thereby forming an annular flat surface. When the portion 8, the damper 7, and the portion 9 having the central hole are integrally formed of resin, the structure that is soft in the vertical direction and hard in the central direction and that supports the magnetic circuit can be accurately and easily formed. The bobbin 21 around which the coil 3 is wound may also be integrally molded. Further, an annular resin molding material 12 having a plurality of claw-shaped protrusions 13 is adhered to the cover 2 outside the outer periphery of the yoke 5 of the magnetic circuit, and a rubber bottom portion 15 for supporting the bottom portion of the yoke 5 on the claw-shaped protrusions 13 is formed. A continuous support rubber 14 is hung to flexibly move the magnetic circuit up and down.

Since the plate 6 of the magnetic circuit is formed low in the vicinity of the central hole, the supporting column 16 for supporting the damper 7 is formed.
The portion 19 having a large diameter can be provided at a position lower than the height of the plate 6, and the overall thickness can be reduced. Further, it is possible to reduce the weight by guiding the magnetic flux to the gap formed with the yoke 5 without saturating the magnetic flux generated from the permanent magnet 4.

An annular gap having a large magnetic flux density is formed between the yoke 5 and the plate 6 facing each other so that the coil 3 can move up and down. The elastic material 10 is provided on the fixed cover 2 with which the annular flat portion 8 of the vibrating body 1 to which the coil 3 is adhered collides, so as to reduce the impact at the time of collision and suppress the generation of collision noise. In this case, the annular resin molding material 12 having the claw-shaped projections 13 may be adhered to the cover 2, and the annular flat portion 8 may be adhered via the elastic material 10. In this case, the elastic material 1
Instead of interposing 0 between them, the annular flat portion 8 may be adhered by a sheet-like adhesive layer or an adhesive having some elasticity.

In FIG. 2, the magnetic circuit of the embodiment shown in FIG. 1 is displaced downward, the driving force of the coil 3 and the reaction from the magnetic circuit are applied to the coil 3, and the annular flat portion 8, elastic member 10,
The state where vibration is applied to the cover 2 through the annular resin molding material 12 is shown. When the frequency is as low as several tens of hertz, the cover 2 vibrates with a relatively large amount of displacement, causing external vibration. Further, when the frequency is as high as several hundreds of hertz to 3 kilohertz, the cover 2 vibrates with a small displacement amount to generate sound to the outside.

When a drive current is applied to the coil 3, as shown in FIG.
As shown in FIG. 2, it is preferable that the vibrating body 1 in FIG. 2 is an alternating current mainly having a polar side that becomes a driving force in a direction opposite to the permanent magnet 4. The reason why the square wave 35 is selected is to increase the level of vibration and sound, but when collision occurs when vibrating at a low frequency, unnecessary sound containing a large amount of high frequency components is generated. Therefore, unnecessary sound can be suppressed by changing the square wave 35 of the driving AC current having a polarity on one side to 36 and 37 in which the rising and falling slopes of the square wave are relaxed.

In the cross-sectional view of the embodiment of the present invention shown in FIG. 1, the cover 2 does not have a plurality of holes on the vibrating body 1, and the vibrating body 1 does not directly generate a sound, but the driving force of the coil 3 and the magnetic force. Since the cover 2 is vibrated by the reaction force of the circuit to generate a sound, unlike the vibrating body 38 having a dome-shaped portion as shown in the conventional example of FIG. 8, it does not have a dome-shaped portion. .

The actuator used in the present invention is shown in a partially cutaway perspective view in FIG. The plurality of spiral dampers 7 are provided inside the annular flat portion 8 to which the coil 3 is adhered and fixed, and the outer diameter of the yoke 5 of the magnetic circuit can be small in spite of the permanent magnet 4 having a relatively large diameter. .

FIG. 6 is a perspective view of the vibration actuator for generating sound and low frequency vibration of the present invention as seen from below, showing a state in which the yoke 5 is fixed at the lower end 20 of the support column. The electrode wires 31 and 32 drawn from the coil are preferably connected to the terminals 33 and 34.

FIG. 3 is a sectional view showing another embodiment of the vibration actuator for generating sound and low frequency vibration according to the present invention. The support column 22 is made of metal, and supports the portion 9 having a central hole integrated with the damper 7 by a support portion 25 having a large diameter and penetrating the support column 22. It is configured such that the large-diameter portion 23 suppresses the deformation and the lower end portion 24 is deformed to fix the magnetic circuit and the vibrating body.

Further, FIG. 4 is a sectional view showing another embodiment of the vibration actuator for generating voice and low frequency vibration of the present invention. The support column 26 has a large diameter part in the middle, supports the part 9 having a central hole integrated with the vibrating body, holds the yoke 5 with the large diameter part 30 at the lower end, and further fixes it. The end 2 on the support column 26 with the ring 29
The magnetic circuit and the vibrating body are fixed and supported by being fitted into the housing 8 and being bonded if necessary.

[0018]

Since the present invention is constructed as described above, it has the following effects.

In the vibration actuator for generating voice and low frequency vibration of the present invention, the permanent magnet, the yoke and the plate which form the magnetic circuit, and the vibrating body can be entirely fixed by the supporting column with the central hole having substantially the same diameter. Therefore, the labor of centering in the assembling process can be omitted, and further, they can be fixed at the same time. Further, as shown in the embodiment, it is possible to omit the bonding process, so that it can be completed in a short time.

Since they are mechanically fixed, the probability of breakage is small even when a large impact is repeatedly applied from the outside, and the reliability can be improved. In addition, even when fixing with adhesive, the adhesion area can be made relatively large,
Similarly, the reliability can be relatively high.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vibration actuator for generating sound and low frequency vibration according to the present invention.

FIG. 2 is a cross-sectional view showing an operating state of FIG.

FIG. 3 is a sectional view of another embodiment of the present invention.

FIG. 4 is a sectional view of another embodiment of the present invention.

FIG. 5 is a partial cross-sectional perspective view of an actuator used in the present invention.

FIG. 6 is a perspective view of the embodiment of FIG. 1 or FIG. 3 seen from below.

FIG. 7 is a diagram showing an example of a waveform of a drive current used in the present invention.

FIG. 8 is a sectional view of a conventional vibration actuator for generating voice and low-frequency vibration, which is a premise of the present invention.

[Explanation of symbols]

1, 38 vibrating body 2,39 cover 3, 40 coils 4,41 Permanent magnet 5,42 York 6,43 plates 7,44 damper 8,45 circular flat part 9 Portion with central hole 10 Elastic material 11,46 York top 12 annular resin molding material 13 Claw-shaped projection 14,47 Support rubber 15 Rubber bottom 16,22,26 Support pillar 17,29 ring 18, 23, 28 top end 19, 25, 27 Larger diameter part 20, 24, 30 lower end 21 bobbins 31, 32 electrode wire 33, 34 terminals 35 square wave

Continuation of the front page (56) Reference JP-A-9-233798 (JP, A) JP-A-9-308209 (JP, A) JP-A-10-94234 (JP, A) JP-A-10-165892 (JP , A) JP 2000-325880 (JP, A) JP 2000-317398 (JP, A) Actual Kaihei 5-48447 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B06B 1/04 H04R 1 / 00,9 / 02

Claims (6)

(57) [Claims] 1. A permanent magnet having a central hole in a magnetization direction,
With a yoke having a central hole attached to one magnetic pole end surface of this permanent magnet, a magnetic circuit having an annular magnetic gap is formed, and a coil wound around a bobbin forming a vibrating body is arranged in the magnetic gap, In a vibration actuator having an electric vibration converter attached to a cover, which applies an AC electric signal to the coil to cause relative vibration between the coil and the magnetic circuit, a central hole portion of the magnetic circuit including the permanent magnets. The central hole portion of the vibrating body having the coil is fixed by a non-magnetic support column, the magnetic circuit is flexibly supported by the cover with a flexible structure, and the AC signal has a frequency lower than a sound frequency. When the signal is a signal, the relative vibration is transmitted to the cover through the flexible structure, and when the AC signal is a high frequency sound frequency, the relative vibration causes the relative vibration. Voice and low-frequency vibration generating vibration actuator over, characterized in that the emitting sound and vibration. 2. The bobbin for supporting the coil of the vibrating body is configured by integrally molding a resin having a circular flat portion, a spiral damper portion, and a portion having the central hole. Vibration Actuator for voice and low frequency vibration generation. 3. The voice and low frequency wave according to claim 1, wherein a magnetic plate having a structure in which a central hole portion is lowered is used on the other magnetic pole surface of the permanent magnet of the magnetic circuit. Vibration actuator for vibration generation. 4. The vibration actuator for generating sound and low frequency vibration according to claim 1, wherein a large diameter portion is provided in the middle of the support pillar, and upper and lower end portions of the support pillar are deformed and fixed. . 5. A large diameter portion at the upper end of the support column.
2. The vibration actuator for generating sound and low frequency vibration according to claim 1 , wherein the upper end is restrained and the lower end is deformed and fixed. 6. A large-shaped portion is provided in the middle of the support pillar.
In addition to forming a large diameter part at the bottom end
The vibration actuator for voice and low frequency vibration generation according to claim 1, wherein a lower side is restrained and a fixing ring is fitted and fixed to an upper end portion.